This is double elimination so any project that looses a comparison will drop to the lower bracket. Projects failing a comparison in the lower bracket are out of contention. When both brackets have been reduced to one project, those top projects will be compared to determine the favorite project of the participating community of voters.
I would ask that if you have seen a project in the bracket that you think should make it to the review, irregardless of its standing in the bracket, that you support the project, and try to give it a bump by sharing it with others you think might support it on LEGO Ideas. Even better, share it with websites that you think might post on it bringing in the fans during these final days.
For example, Wallance and Gromit did very well in Round One. FOLs who really want to see this project come to light might post on the Wallace and Gromit forum or the The Wallace and Gromit facebook page.