Iowa Sen. Charles Grassley continues to appear to be in good shape in his quest for a sixth term in office. A new Rasmussen poll (June 14, 500 LV, MoE +/- 4.5%) finds Grassley polling above 50% and leading Democrat Roxanne Conlin by 17 points.

Grassley 54
Conlin 37
Und 8

Grassley has extended his lead since late April, when Rasmussen found him up 14 points.

RCP rates this race Likely Republican.

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