Barney Frank's Mistake

According to this December 22, 2007 item in the "Religion" section of the Washington Post, Barney Frank regrets two of the votes he recently cast:

Rep. Barney Frank (D-Mass.) says he was wrong to vote different ways on House resolutions recognizing Christmas and Ramadan.

Instead of voting for the Muslim holiday and abstaining on the Christian one, Representative Frank says he should have abstained on Ramadan as well....

In my experience, politicians don't make such admissions unless constituents have applied some pressure. Of course, it is possible that Representative Frank realized all on his own that his differing votes evidenced a double standard.

Why do I have doubts about his revised view, just in time for Christmas? I've become highly skeptical about the integrity of all politicians — the result of my observing politicians' ambivalence and their lack of integrity as they jockey for power and votes.

Returning now to the remainder of the item in the Washington Post, Representative Frank further explained about his change of mind:

Frank says he's Jewish and doesn't observe either holiday, but adds that he wouldn't support a Yom Kippur resolution, either. He says Congress should stay out of religious matters and let Americans worship as they wish. In the future, Frank says he'll abstain on all such resolutions.

I've never quite understood why politicians abstain from voting — unless, of course, they aren't educated enough about a certain matter to vote responsibly. Isn't our elected representatives' job to make decisions?

Why do politicians abstain from a vote, anyway? I look forward to commenters helping me to understand why politicians take non-positions on issues before them.