Democratic vice-presidential candidate Joe Biden has been joined by Joe the plumber, Joe Six-Pack and others.
So here is a guide to six Joes in the news:
JOE THE PLUMBER
Joe the plumber confronted Barack Obama on a walkabout in Toledo, Ohio, asking awkward questions about his plan to increase income tax on high earners. "I'm getting ready to buy a company that makes $250,000 to $280,000 a year," he said. "Your new tax plan is going to tax me more, isn't it?" John McCain seized on this - and on Mr Obama's reply, that "when you spread the wealth around, it's good for everybody". He mentioned Joe Wurzelbacher the plumber more than 20 times in the final presidential debate.
The original Joe, or Samuel, has spawned a number of others. Mr Obama's running mate, Joe Biden, said on the Tonight Show with Jay Leno on Thursday that in his neighbourhood they didn't know many plumbers making $250,000 a year, and that people were "kind of worried about Joe the fireman, Joe the policeman, Joe the real plumber with a licence".
JOE SIX-PACK
Joe Six-Pack is a close relative of Regular Joe, Average Joe, Ordinary Joe, Joe Schmo, Joe Blow and others. The name "Six-Pack" refers to his favourite drink rather than a well-sculpted washboard stomach.
So Joe Six-Pack is definitely not a Washington insider. Nor is he responsible for the problems on Wall Street. He is a male version of the hockey mom. This is how Mrs Palin put it in the vice-presidential debate on 2 October, answering a question about the financial crisis: "One thing that Americans do at this time, also, though, is let's commit ourselves, just everyday American people, Joe Six-Pack, hockey moms across the nation, I think we need to band together and say, 'Never again, never will we be exploited and taken advantage of again by those who are managing our money and loaning us these dollars.'"
The Palins may be a bit wealthier than some Joe Six-Packs and hockey moms.
JOE "LUNCH-PAIL" BIDEN
Joe Biden, Barack Obama's vice-presidential candidate, is the most prominent Joe on the Democratic side of the race. John McCain, a four-term senator, has referred to him as "Joe the six-term senator", but conservative columnists and bloggers prefer the derisive "Lunch-pail Joe Biden" - a reference to his habit of talking up his working class roots in the coal-mining town of Scranton, Pennsylvania (where most working men would have taken their lunch to work in a lunch box, or lunch pail).
It was this lunch-pail tendency that led him during his bid for the 1988 Democratic nomination to recycle parts of a speech by British Labour Party leader Neil Kinnock, asking why it was that he was the first Biden (Kinnock) in a thousand generations to go to college.
Joe Lieberman, an Independent (formerly Democratic) senator from Connecticut, has been tipped as a possible Secretary of Defense or Secretary of State if John McCain wins the White House. Both are foreign policy hawks. Mr Lieberman endorsed Mr McCain in a speech at the Republican convention, and has appeared at countless McCain rallies around the US - he knows the routine, having been Al Gore's running mate on the Democratic presidential ticket in 2000.
If Mr McCain does not win the White House, Mr Lieberman's role in the Senate could be an interesting one. Since the 2006 mid-term elections, he has continued to caucus with the Democrats in the Senate, giving them a majority of one.
SHOELESS JOE JACKSON
Shoeless Joe has only played a bit-part in this election - alluded to by Sarah Palin, knowingly or not, in the vice-presidential debate with Joe Biden.
This is how it happened. Joe Biden launched into lunch-pail mode for one of his attempts to draw parallels between the McCain/Palin ticket and George Bush: "Look, all you have to do is go down Union Street with me in Wilmington or go to Katie's Restaurant or walk into Home Depot with me where I spend a lot of time and you ask anybody in there whether or not the economic and foreign policy of this administration has made them better off in the last eight years."
Sarah Palin turns on folksy charm
Sarah Palin replied: "I'll say it ain't so, Joe, there you go again, pointing backwards again. You prefaced your whole comment with 'the Bush administration'. Now doggone it, let's look ahead and tell Americans what we have to plan to do for them in the future."
The words "Say it ain't so, Joe" date back to 1920. They were allegedly spoken to Chicago White Sox baseball star Shoeless Joe Jackson by a broken-hearted young supporter, as Joe was leaving a grand jury hearing where he had admitted taking part in a match-fixing scandal.
(Chat show host David Letterman has suggested Mrs Palin set-up her use of the "Say it ain't so" quotation by asking Mr Biden before the debate if she could call him Joe.
GI JOE
Some of the Sarah Palin dolls - and reaction to them
You can buy GI Joe-style action figures of Barack Obama, John McCain and Sarah Palin. But the real GI Joes are the sons of the candidates who are, or have been, serving in Iraq.
Captain Beau Biden (real name Joseph Robinette Biden III, in other words, a genuine GI Joe) introduced his father at the Democratic Convention in Denver, with an oblique reference to his forthcoming deployment: "But because of other duties, it won't be possible for me to be here this fall to stand by him the way he stood by me. So I have something to ask of you. Be there for my dad like he was for me." His father responded: "Beau, I love you. I am so proud of you." Two days later, Mr McCain picked Mrs Palin as his running mate. She gave the Republican Convention the news that her son, Private First Class Track Palin, would, on 11 September, "deploy to Iraq with the Army Infantry in the service of his country".
Both VP candidates made speeches at their sons' deployment ceremonies. John McCain, by contrast, has maintained an almost total silence about his own son Jimmy's role in Iraq - a marine who returned from a tour of duty in February. Another of Mr McCain's sons, Jack, aged 21, is to graduate from the Naval Academy in 2009. This gives rise to the possibility of Mr McCain becoming the first occupant of the White House since Eisenhower to have a son at war.



