Goolge Analytics attributes conversion to the most recent campaign.
To attribute conversions to the first campaign, tag all campaign links with utm_nooverride=1
Google Analytics attributes conversions to the campaign that most recently referred the visitor.
For example, let’s say that someone discovers your site by clicking one of your AdWords ads.
Then, they come back to your site by clicking a banner ad that you’ve tagged with campaign variables. This time, they convert to one of your goals.By default, the banner ad will get the credit for the conversion, not the AdWords ad that originally referred them.To change this behavior, you can tag all of your campaign links with utm_nooverride=1.
If you do this consistently with all of your campaigns, Google Analytics will attribute conversions to the first referring campaign, instead of the most recent one.
Note that the utm_nooverride setting can be used in conjunction with autotagging.
