A new Zogby poll shows Barack ObamaBarack Hussein ObamaThe Memo: Centrists change tone of Democratic race Political purity tests are for losers Deportations lower under Trump administration than Obama: report MORE building momentum against John McCainJohn Sidney McCainConservative group cuts ties with Michelle Malkin Democratic debate at Tyler Perry's could miss the mark with black voters Donald Trump's 2020 election economic gamble MORE and starting to open an electoral college lead.

Obama leads McCain nationally, 44 percent to 38 percent, with Libertarian candidate Bob Barr polling at 6 percent.

Carried out to the fifty states, the poll shows Obama holding a 273 to 158 electoral college lead over McCain with 105 electoral college votes undecided. The number needed to win is 270.

"Obama is in the driver