The MN Campaign Finance and Disclosure Board makes finding campaign finance data a little more complex than one might expect. The data isn't as recent as one might expect either - 12/31/2007 in most cases and most information provided is in *.pdf files. Exceptions are noted.
Independent Expenditures - http://www.cfbreport.state.mn.us/dyncfb/cfbsearch5.php
Contributions Received by a Candidate - http://www.cfbreport.state.mn.us/dyncfb/cfbsearch1.php
Contributions Made by Individuals - http://www.cfbreport.state.mn.us/dyncfb/cfbsearch2.php
Contributions Received by Party Units or Political Committees - http://www.cfbreport.state.mn.us/dyncfb/cfbsearch3.php
Contributions Made by Party Units or Political Committees - http://www.cfbreport.state.mn.us/dyncfb/cfbsearch4.php
Political Party, Political Committee and Political Fund Reports - http://www.cfbreport.state.mn.us/rptViewer/viewRptsOther.php
On the Board home page, "Political Party Units" are listed as a separate link, but they're really a subset of the overall Political Party database.
Candidate Report of Receipts and Expenditures - http://www.cfbreport.state.mn.us/rptViewer/viewRptsCan.php
Lobbyist Disbursement Reports - http://www.cfbreport.state.mn.us/rptViewer/viewRptsLob.php
Data through 2008
Public Official Lists - http://www.cfboard.state.mn.us/po_lists.html
Reports in *.html; content undated.