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WASHINGTON (AP) - It would seem a lobbyist's dream: rounding up votes for a proposal backed by more than 8 in 10 people in polls. Yet, gun control supporters are struggling to win over moderate Democrats for their drive to push expanded background checks through the Senate next month.

Amid a $12 million TV advertising campaign financed by New York Mayor Michael Bloomberg, gun control groups were holding rallies around the country Thursday aimed at pressuring senators to back the effort. President Barack Obama was meeting at the White House with gun violence victims as well.

Even so, moderate Democratic senators like Mark Pryor of Arkansas and Heidi Heitkamp of North Dakota are stressing their allegiance to their own voters' views and to gun rights. And so far, many are avoiding specific commitments.

(Copyright 2013 The Associated Press. All rights reserved.)

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