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Hello on this Tuesday, the 5 day of February 2008. I'm Kristin Volk with a UPI Headline Update. Voters from coast to coast are heading to the polls on this Super Tuesday... a pivotal day for the Democratic and Republican presidential hopefuls. Twenty-four states are voting in what is nearly a national polling day. Senators Hillary Clinton and Barack Obama are in a virtual dead heat nationally for the Democratic presidential nomination. On the Republican side, Arizona senator John McCain is heading into today as the front-runner. But former Massachusetts governor Mitt Romney is stepping up his attacks on McCain, declaring he's the true conservative. Former Arkansas governor Mike Huckabee, who's still in the race, is aiming for a strong showing in the South. Meanwhile, John McCain has won a key endorsement from former New York Governor George Pataki. That backing, coupled with the support of Governor Arnold Schwarzenegger of California, could play an important role in today's vote. Former New York Yankees Pitcher Roger Clemens is on Capitol Hill today to testify about whether he used performance-enhancing drugs. His appearance comes one day after his Yankees teammate and workout partner, Andy Pettitte, gave a deposition there yesterday. Both players are part of a hearing next week that will reportedly focus on allegations made by the Mitchell Report that Clemens was injected more than a dozen times with human growth hormone and steroids. The 45-year-old pitcher has denied ever taking any drugs. Thanks for watching today's news update. Go to upi.com to watch our latest special segment called, Homeless with a Family.