simply because the Republican platform is Anti-Choice ("Anti-Abortion") to some voters, the republicans can stick a knife right in their backs (and they do), republicans can & do take money & benefits right out of their pockets and even ship their jobs away.... yet many voters will still vote only republicans because of this one issue.

Republican leaders & their think tanks know this and exploit this extremely well.

The republicans use this tactic of hate & fear for other issues as well... gay marriage, minorities rights, gun control...etc. etc...

Many who vote republican vote on single issues.....republicans always keep in the publics mind as in today's Super bowl ad....Republicans make sure every chance they get to exploit these issues and keep public attention focused on them so at voting time republicans make it clear of their position & platform.

These single issue voters make up a large percentage of the republican party, without them the republicans would almost cease to exist.