Pennsylvania Democrat Doug Pike has solidified his grip on his party’s nomination in the politically competitive 6th District.

On Monday, Pike’s campaign circulated a report in a local newspaper that state Sen. Andy Dinniman has decided not to run against Pike in a Democratic primary next spring.

Among the reasons Dinniman cited is the redistricting that will ensue after the 2010 election. Pennsylvania is likely to lose one of its 19 House seats in reapportionment, and many of the state’s congressional districts could be dramatically reshaped.