The 2018 election in Colorado begins in earnest Tuesday as statewide campaigns deploy to shopping malls, street corners and parking lots to gather the 10,500 voter signatures needed to get their candidates on the ballot. Much of the attention will focus on the governor’s race, where new campaign rules and a crowded field of Democratic and Republican candidates will make it difficult to secure a spot on the June 26 primary ballot. For Republicans, the petition push is the first since forged signatures and lawsuits stained the 2016 primary for U.S.