DENVER (AP) - By 2030, Colorado's population will grow from 5 million to 7 million people, thanks in part to its strong economy and its constitutional limits on taxes.

DENVER (AP) By 2030, Colorado's population will grow from 5 million to 7 million people, thanks in part to its strong economy and its constitutional limits on taxes.

But those voter-sanctioned tax limits could someday jeopardize the state's success, which depends on good roads.

This year, the state's Democratic governor is trying to find ways to squeeze more revenue for roads from the budget.

But Republicans don't want to tamper with a constitutional amendment that keeps a tight limit on those taxes.

That's sparking a battle over the size of government in a perennial battleground state just as the presidential election gets into full swing.