WASHINGTON — A new national survey finds that the political split among Americans has outgrown the voting booth over the last two decades.

The Pew Research Center says about one in five Americans holds across-the-board conservative or liberal views, up from one in 10 in 2004.

Pew Research says ideological purity is more widespread among the politically engaged than the general public with the ideological shifts being accompanied by increasing animosity across party lines.

The study says political ideology is affecting people’s choices of associates and where to live and get information.