Republican Sean Bielat is giving 15-term U.S. Rep. Barney Frank his most competitive reelection race in years, according to our new WPRI 12 poll being released on air right now. The survey of 400 likely voters in Massachusetts’ 4th Congressional District was conducted Oct. 14 to 17 by Fleming & Associates. The margin of error is plus or minus 5%. Here are the key numbers:

• Frank: 49%
• Bielat: 37%
• Not sure: 12%

There’s much more in my full story over on WPRI.com, including insight from Eyewitness News political analyst Joe Fleming and a look at which groups of voters are learning toward Frank and which ones are going for Bielat. You can also find out how voters feel about President Obama, Sens. Scott Brown and John Kerry, and the financial crisis.

And if you missed it earlier, check out my earlier posts about Frank’s new campaign spending numbers, why we did the poll, and whether this is really a race.