LAKEWOOD, Colo. -

A campaign to raise income taxes to pay for public school upgrades is getting started in earnest.               

Gov. John Hickenlooper helped launch the public campaign for Initiative 22 Thursday at Green Mountain High School in Lakewood.         

It would increase income taxes nearly $1 billion a year to pay for school improvements including statewide full-day kindergarten.   

Hickenlooper said it would be an investment in the economic development of Colorado, which he said would still remain a low tax state.    

Supporters have already turned in signatures to petition the question onto ballots in November.            

If voters approve the schools tax, they'll also enact an education funding overhaul that includes new accountability tracking.              

The schools measure would join a marijuana tax question about excise and sales taxes on the newly legal drug.