Voters look at both major parties and ask, is this all there is?

In many states voters are fleeing the Democratic and Republican parties, both of which are straining to hold together disparate factions. Many see the two-party system as unable to meet the nation’s challenges.

At a time when the nation’s partisan divide appears nearly insurmountable – with Republicans and Democrats in Congress unable to agree on much of anything – a growing number of Americans appear to be saying “a pox on both your houses.”

According to a February Gallup Poll, a record 62% of voters say the Republican and Democratic...