1.   And last year, Gore cast the tie-breaking vote on legislation to require background checks for gun buyers at gun shows.

2.   And sales at gun shows, where investigators have found virtually anyone can purchase guns with little questioning, will now require background checks.

3.   As shots were being fired at Heritage High, senators in Washington were preparing to debate whether to require background checks on gun sales at firearms shows.

4.   After the September attacks, Congress imposed new restrictions requiring background checks of many foreigners studying at flight schools here, and immigration officials tightened visa requirements.

5.   But it has no plans to require background checks of all volunteers.

6.   But the law did not require the checks, and they continued only about three months.

7.   Colorado and Oregon easily passed ballot initiatives to require background checks of buyers at gun shows, where federal law does not require such investigations.

8.   Democrats question his commitment to federal and state efforts to require background checks at gun shows.

9.   Current federal law only requires checks for those who buy from federally licensed dealers.

10.   Democrats cited that provision as one of the main reasons they planned to re-introduce a new version of their own amendment requiring background checks at gun shows.