Itâ€™s Mini-Super Tuesday, the biggest primary day of the 2010 election cycle. All eyes are on three key Senate primaries: Democratic incumbent Arlen Specter vs. Congress member Joe Sestak in Pennsylvania; two-term Democratic incumbent Blanche Lincoln vs. Lieutenant Governor Bill Halter in Arkansas; and on the Republican side, Secretary of State Trey Grayson vs. political newcomer Rand Paul in Kentucky. We speak to leading pollster Nate Silver of the polling analyst site FiveThirtyEight.com. [includes rush transcript]moreless
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