Read the Reuters/C-Span/Zogby poll

Hillary Clinton and Barack Obama are tied at 45 percent each in Texas while Obama holds a statsitically insignificant 45 percent to 43 percent lead in Ohio, according to this survey conducted Feb. 27-29. It has a 3.8 percent margin of error. But while both these races are competitive as far as popular vote, the closeness of each race and the fact that Obama is showing significant strength in big urban areas (Dallas and Houston, in Texas; Cleveland and Columbus, in Ohio) augurs bad news for Clinton in the delegate chase. (For a good analysis of the challenge facing Clinton on delegates, read Marc Ambinder’s “Inside Delegate Math”).

In Harris County, home of Houston, breakdowns provided the Houston Chronicle by Zogby have Obama leading 50 percent to 41 percent. Obama runs stronger than Clinton among higher-income voters while she does best with low-income voters. Clinton has 65 percent support among Hispanic voters and Obama enjoys 73 percent support among black voters.

On the GOP side, John McCain leads Mike Huckabee 58 percent to 23 percent in Ohio and 54 percent to 31 percent in Texas. The poll found that McCain has been having some success reducing resistance to his candidacy from conservatives.