Texas Poll: Hillary Clinton 48%, Barack Obama 48%.

Los Angeles Times National Polls Poll: Hillary Clinton 42%, Barack Obama 48%.

Ohio Poll: Mike Huckabee 30%, John McCain 55%, Ron Paul 7%.

Texas Poll: Mike Huckabee 31%, John McCain 56%, Ron Paul 9%.

Ipsos National Polls Poll: Mike Huckabee 27%, John McCain 53%, Ron Paul 8%.

Gallup National Polls Poll: Mike Huckabee 21%, John McCain 63%, Ron Paul 6%.

Ohio Poll: Hillary Clinton 50%, Barack Obama 46%.

Texas Poll: Hillary Clinton 46%, Barack Obama 50%.

CBS News National Polls Poll: Hillary Clinton 38%, Barack Obama 54%.

Ipsos National Polls Poll: Hillary Clinton 43%, Barack Obama 46%.

Ohio Poll: Mike Huckabee 40%, John McCain 51%, Ron Paul 6%.

Ohio Poll: Mike Huckabee 20%, John McCain 55%, Ron Paul 5%.

Texas Poll: Mike Huckabee 41%, John McCain 45%, Ron Paul 10%.

Ohio Poll: Hillary Clinton 49%, Barack Obama 39%.

Ohio Poll: Hillary Clinton 47%, Barack Obama 39%.

Ohio Poll: Hillary Clinton 51%, Barack Obama 40%.

Texas Poll: Hillary Clinton 42%, Barack Obama 50%.

Ohio Poll: Hillary Clinton 46%, Barack Obama 54%.

Texas Poll: Hillary Clinton 43%, Barack Obama 57%.

North Carolina Poll: Hillary Clinton 31%, Barack Obama 45%.