Texas: Maybe try Bill White or Chet Edwards?
You've basically just named the entire Democratic bench, which sums up the mess the Texas Democrats have become.
They can only win a statewide office here if their candidate: (1) has plenty of money and the ability to raise plenty more; (2) hasn't served in Congress and thus can't be tied to Obama, the national Democratic Party or Washington in general; (3) has the respect of the business community, rather than just trial lawyers and black and Hispanic interest groups.
Bill White met all three of these criteria and he still lost. Chet Edwards meets none of these criteria.