Q: If you heard that Donald Trump was supporting a presidential candidate, would you be more likely to vote for that candidate, less likely to vote for that candidate or wouldn't it make any difference?

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The Washington Post - Pew Research Center poll

In this poll:

Republican candidates looking for any conceivable advantage in their party's nominating contest may welcome an endorsement from former president George W. Bush, but may be better off avoiding a nod from former rivals such as including Michele Bachmann and Herman Cain.

This poll was conducted for The Washington Post and the Pew Research Center by telephone January 5 to 8, 2012, among a random national sample of 1,000 adults, including users of both conventional and cellular phones. The results from the full survey have a margin of sampling error of plus or minus four percentage points. Sampling, data collection and tabulation by Princeton Survey Research Associates International (PSRAI) of Princeton, NJ.