WASHINGTON (CNN) -- Sen. John McCain became the likely Republican nominee after Mitt Romney decided to suspend his campaign Thursday. Now, the Democrats are debating who would do better against the Arizona Republican.

Two polls this month have asked registered voters nationwide how they would vote if the choice were between McCain and Democratic Sen. Hillary Clinton.

A CNN poll, conducted by the Opinion Research Corporation February 1-3, shows Clinton three points ahead of McCain, 50 percent to 47 percent. That's within the poll's margin of error of 3 percentage points, meaning that the race is statistically tied..

A Time magazine poll, conducted February 1-4, also shows a dead heat between Clinton and McCain. Each was backed by 46 percent of those polled.

Sen. Barack Obama believes he can do better, arguing "I've got appeal that goes beyond our party."

In the CNN poll, Obama leads McCain by 8 points, 52 percent to 44 percent. That's outside the margin of error, meaning that Obama has the lead.

And in the Time poll, Obama leads McCain by 7 points, 48 percent to 41 percent -- a lead also outside of the poll's margin of error of 3 percentage points.

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