take a survey. boom, right there. >> and it gives volunteers what's called dynamic scripting, prompting different pitches to voters, depending on their answers. information instantly sent back to rnc headquarters. >> we need to make sure they know when the election and figure out who they're going to support so we can drive them out. >> now in the final push, thousands of staffers and volunteers are using that app in battleground states across the country, the rnc leading trump's ground operation, says they will complete 17 million door knocks the by election day, up from 11.5 million in 2012. it's all very ambitious, but it's been done before, by the democrats. >> i'm doing great. what's your name? >> republican strategists admit they're trying to emulate the obama machine that crushed the gop for two cycles. armies of democratic activists are spread out over the same key states as republicans. clinton campaign aides say