The opinions expressed below are Jon Keller's, not those of WBZ-TV, CBS News or Paramount, a Skydance Corporation.

Could it be a Rep. Seth Moulton versus Sen. Ed Markey battle in next year's Democratic U.S. Senate primary in Massachusetts?

The Salem congressman is seriously considering running against the incumbent, he confirmed Wednesday.

The 79-year-old Markey has been in public office for 52 years, 49 of them in Congress. And with 80-something politicians increasingly out of vogue in the Democratic party these days it's no surprise that the 46-year-old Moulton hears opportunity knocking, saying in a statement to WBZ-TV and other news outlets that, "While I continue to look at the best options to represent Massachusetts moving forward, I have not yet made a decision about running for

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