Offered without endorsement of any kind (hat tip Ace), the latest Fox News Poll (PDF results file here):

In the narrowed field, McCain now leads among Republicans with 48 percent, far outdistancing Mitt Romney at 20 percent and Mike Huckabee at 19 percent. Ron Paul receives 5 percent. The number of undecided voters has dropped from 13 percent in December to 5 percent today.

[ . . . ]

Clinton and Obama both essentially tie McCain in hypothetical head-to-head matchups. Among registered voters nationwide, the poll finds that 44 percent back Clinton and 45 percent McCain. Similarly, 44 percent prefer Obama, while 43 percent choose McCain. These results fall within the poll’s margin of sampling error.

Clinton (+14 points) and Obama (+18 points) each have a double-digit advantage over Republican Mitt Romney when tested in two-way matchups.

Between McCain and Romney only, 62% of Republican respondents would vote for McCain, and 29% Romney; for Independent respondents, the split is 60-21 for McCain.

Hillary was seen as the candidate most likely to embarrass the country, and the candidate who would do anything to win the election, including something unethical. All of the Republican candidates were way behind her on both of these questions, for all respondents.

The respondent breakdown for the poll was 42-33-20 (Democrat, Republican, Independent). The margin of error was ±3.