Tripartisan
From Conservapedia
Tripartisan is used to describe the common agreement between three major American political groups; Republican, Democratic and Independents. Due to discontent with the two major political parties, an increasing number of citizens have registered themselves as Independents. Therefore, Independents have grown dramatically in recent years and demand their concerns be addressed by all political parties.
When talking about the need for lifting restrictions on American oil production, American Solutions says that they have the tripartisan support of 1.5 million Americans.