Mon petite, you do not know history . . . Unions have indeed supported Republicans in the past:
http://www.boston.com/news/nation/ar...kabee_edwards/
By John Whitesides, Political Correspondent | August 30, 2007
WASHINGTON (Reuters) - One of the biggest U.S. trade unions made an unusual dual presidential endorsement of Democrat Hillary Clinton and Republican Mike Huckabee on Thursday, while Democrat John Edwards won the 2008 backing of the carpenters' union.
http://www.usatoday.com/news/opinion/e1940.htm
In 1972, the Teamsters backed President Nixon, a Republican, but stayed neutral in 1976. It supported Ronald Reagan, another Republican, in 1980 and 1984, and endorsed Bush's father in 1988. In 1992, however, the union abandoned Bush and joined the AFL-CIO in endorsing Democrat Bill Clinton. It did not support Clinton's 1996 re-election, and also rejected GOP nominee Bob Dole.