Ohio Poll: Hillary Clinton 48%, Barack Obama 40%.

Diageo National Polls Poll: Mike Huckabee 25%, John McCain 53%, Ron Paul 7%.

Ohio Poll: Hillary Clinton 50%, Barack Obama 43%.

Texas Poll: Hillary Clinton 47%, Barack Obama 44%.

Texas Poll: Hillary Clinton 48%, Barack Obama 47%.

Diageo National Polls Poll: Hillary Clinton 45%, Barack Obama 43%.

Diplomats Ordered Out of Serbia Following Attack on U.S. Embassy in Belgrade

Texas Poll: Mike Huckabee 29%, John McCain 54%, Ron Paul 8%.

Gallup National Polls Poll: Mike Huckabee 22%, John McCain 62%, Ron Paul 5%.

Fox News National Polls Poll: Mike Huckabee 34%, John McCain 51%, Ron Paul 7%.

Pennsylvania Poll: Hillary Clinton 44%, Barack Obama 32%.

Texas Poll: Hillary Clinton 50%, Barack Obama 45%.

Gallup National Polls Poll: Hillary Clinton 45%, Barack Obama 44%.

Fox News National Polls Poll: Hillary Clinton 44%, Barack Obama 44%.

John McCain Denies Inappropriate Relationship with Lobbyist Vicki Iseman

John McCain Rebukes Relationship Rumors with Vicki Iseman

Ohio Poll: Mike Huckabee 29%, John McCain 61%, Ron Paul 5%.

Zogby National Polls Poll: Mike Huckabee 32%, John McCain 47%, Ron Paul 7%.

Gallup National Polls Poll: Mike Huckabee 24%, John McCain 58%, Ron Paul 5%.

Ohio Poll: Hillary Clinton 52%, Barack Obama 43%.