Republican presidential candidate Rudolph Giuliani says he feels great after being hospitalized last week for what he said was a painful headache.

Speaking on ABC's This Week talk show Sunday, the former New York mayor said he had suffered a terrible headache that worsened through the day Wednesday. Giuliani's staff originally said he had suffered influenza-like symptoms.

Giuliani, who is a survivor of prostate cancer, says his doctor ran a lot of tests and they all came back negative.

Meanwhile, in an interview with ABC's Face The Nation, Democratic presidential hopeful Senator Barak Obama discussed what he has accomplished in the Senate, including ethic reforms and pushing for transparency in federal spending.

The show also interviewed Republican presidential candidate Mike Huckabee, who said he is out to change the Republican party. He said it needs to be more conclusive.

A new Boston Globe poll indicates that among Republican presidential candidates, Senator John McCain is within three percentage points of front-runner Mitt-Romney in the New Hampshire primary contest. Giuliani is in third place followed by Huckabee.

On the Democratic side, the polls have Obama with 30 percent, with New York Senator Hillary Clinton at 28 percent.

Some information for this report was provided by AP and Reuters.