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1.
a republican who has crossed party lines in support of democratic presidential nominee Barack Obama.
Tom was a McCain supporter before becoming an Obamacan.
by Matt Bettes February 02, 2008
209 70
 
2.
A registered republican voter in the United States who has decided to cross over to the other party, the Democratic party, during the primary voting season of 2008 and vote for Democratic candidate Barack Obama for President of the United States.
"Eisenhower is one of a small but symbolically powerful group of what Obama recently called "Obamacans"—disaffected Republicans who have drifted away from their party just as Eisenhower Democrats did and, more recently, Reagan Democrats in the 1980s."

- Newweek magazine By Richard Wolffe | Newsweek Web Exclusive, Feb 1, 2008
by eyesonthestreet February 02, 2008
70 27
 
3.
A republican who supports Barack Obama.
My friend John usually votes republican, but I'm sensing that this election he will be an Obamacan.
by Vincent Coppola February 17, 2008
71 41
 
4.
a republican for obabama
I am a registered republican but now I'm a obamacan and supporting and voting for barack obama for president
by d mirto February 12, 2008
49 41
 
5.
An Independent who becomes a democrat for Barack Obama
1) Are you an independent?
2) No i just became an Obamacan
1) What's that?
2)An Independent who becomes a democrat for Barack Obama(:
by U do not need to know tht September 21, 2008
10 19
 
6.
A traditionally Republican voter in an open-primary state who crosses party lines on primary-election day for the sole purpose of skewing the balance of delegates to the 2008 Democratic National Convention toward Barack Obama, not because they support the notion of an Obama presidency but because they dread the notion of a Hillary Clinton presidency; a Republican short-term infiltrator into the 2008 Democratic primary process whose mission it is to stack the deck in favor of the weaker and/or less objectionable Democratic candidate in order to eliminate the stronger candidate from the running and then continue with business as usual, voting for the Republican candidate in November.
The sign on the precinct door read, "Attention Republicans: You can become an 'Obamacan' for a day! Ask for a Democratic ballot and get Hillary out of the picture NOW. You're free to vote Republican as usual in the November election."
by Khrysso LeFey March 02, 2008
13 35