The result of Davies fieldwork in UK elections showed that active local party activities (including GOTV) can be worth up to a 2%-4% swing - this is from an ele

The result of Davies fieldwork in UK elections showed that active local party activities (including GOTV) can be worth up to a 2%-4% swing - this is from an election where 2nd generation electoral computing systems were used. In Scotland we have 3rd generation systems (one system for all elections vertically, local government, Scottish Parliament, Westminster Parliament, European Parliament, and horizontally, 2011, 2008, 2007 back to the 80s). The US parties be roughly considered as having 2 and half generation systems, so you might expect a difference at the top end of that. I don't follow US elections that closely but you can work the numbers out.