Martha Coakley’s (D) campaign is bringing out the big guns in its advertising in the final days before the Massachusetts special Senate election.White House adviser Valerie Jarrett told MSNBC Thursday morning that President Barack Obama has recorded a Web video expressing his support for the attorney general’s candidacy.Coakley has Obama’s “full support,— Jarrett said, but she added that she didn’t know whether he planned to campaign in Massachusetts before Tuesday’s election.The Associated Press reported Thursday that Vicki Kennedy, widow of Sen. Edward Kennedy (D-Mass.), whose death in August triggered the special election, has cut an advertisement for Coakley, as well.Democrats are pushing hard to remind voters whose seat Coakley and state Sen. Scott Brown (R) are competing to fill.In an e-mail sent to supporters Thursday morning, the Democratic Senatorial Campaign Committee wrote, “What you do in the next two minutes could mean the difference between keeping Ted Kennedy’s seat blue, or ceding his seat to a tea-bag Republican,— adding that Democrats need to keep Brown from getting “anywhere near Kennedy’s desk.—The Brown campaign continues to churn out its own ads. The latest, launched Thursday, shows Brown out on the streets, shaking hands with voters, in classic man-of-the-people mode.But another ad launched Thursday might make it harder for him to disassociate himself from the Tea Party movement.The political action committee Our Country Deserves Better, an affiliate of the group Tea Party Express, came out with its planned advertisement declaring, “We at the Tea Party Express endorse Scott Brown for Senate.—And more outside groups jumped into the Massachusetts Senate fray Thursday.The League of Conservation Voters launched a $350,000 television ad campaign on Boston-area broadcast and cable television that will air through election day. In the ad, the environmental group goes after Brown’s opposition to the American Clean Energy and Security Act, which would impose a cap-and-trade system to regulate carbon emissions.“On Tuesday, we can say yes to clean energy jobs and energy independence by electing Martha Coakley as our new Senator,— the ad says. The group has already endorsed Coakley, citing her past work, which included petitioning the Environmental Protection Agency that greenhouse gases pose a threat to public health and welfare.The National Rifle Association has also invested in the race this week to help elect Brown. The gun rights group’s Political Victory Fund disclosed nearly $20,000 in spending on direct mail.