Diana DeGette has served 15 terms in Congress, but has she been effective? Denver voters will decide in primary.

 Diana DeGette has served 15 terms in Congress, but has she been effective? Denver voters will decide in primary.

Another term for Diana DeGette in Congress could elevate her leadership profile, helping to advance legislation. But her two opponents — Melat Kiros and Wanda James — say it’s too little, too late.

In her 16th campaign for Congress, U.S. Rep. Diana DeGette is making a straightforward pitch: If Denver voters send her back to Washington, D.C., she’ll do more with her seat as a seasoned lawmaker t…