With little more than three weeks to go until the primary, a poll taken by Quinnipiac University found U.S. Rep. Kendrick Meek trailing Jeff Greene in the battle for the Democratic nomination for the U.S. Senate election. Meek released his second TV ad on Friday morning, looking to counter the ads Greene has been running for weeks. Polls show that Meek remains unknown to many Florida voters, including a sizeable number of likely Democratic primary voters, but he does little to introduce himself in the new commercial, preferring to hack away at Greene.