Doug Hoffman, the Conservative Party nominee in the three-way special election to replace former Rep. John McHugh (R-N.Y.), went up with his second TV ad of the campaign Tuesday, once again touting his conservative credentials.The 30-second spot, produced by Republican media consultant Nelson Warfield, begins with footage of the anti-government protests in front of the Capitol last month, then has pictures of Hoffman meeting with people in the 23rd district.“There’s something going on today,— a narrator says at the beginning of the ad. “Politicians don’t understand it. But Americans are fighting back. That’s why conservative Republican Doug Hoffman is running for Congress. He’ll fight for strict term limits, reject pork barrel spending, oppose — and refuse — any pay hike for Congress. Army veteran, businessman, NRA member, Hoffman will take our conservative values to Washington. Fight Back. Hoffman for Congress.—Hoffman, a CPA who unsuccessfully sought the Republican nomination, is locked in a tight battle with state Assemblywoman Dede Scozzafava (R) and attorney Bill Owens (D). The first independent poll taken last week showed Scozzafava, a political moderate who has held public office for years, ahead, but with the race fluid.All three candidates are flooding the airwaves in the upstate district, and the Congressional campaign committees and Club for Growth are also on the air.And in a sign of just how unpredictable this race might be, Markos Moulitsas, the liberal blogger who runs the Daily Kos Web site, penned an endorsement of Scozzafava earlier this week — something that’s sure to fuel the anger of Hoffman and the conservative leaders who are aligned behind him.