Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.
The National Institute on Money in State Politics reports that Chesapeake Energy Corp. and several of its subsidiaries have contributed $5.3 million and CEO Aubrey McClendon an additional $1.1 million to state-level candidates, political parties and ballot-measure committees in 18 states since 2000.
Chesapeake had no registered lobbyists in Ohio from 2005 through 2010, but employed seven lobbyists in 2011, the Montana-based group reports.
Only one Chesapeake lobbyist, Brandon Lynaugh, contributed $14,285 to candidates and committees in Ohio in 2006, 2008 and 2010.
The institute said its record reviews do not show any Lynaugh contributions in 2011 or 2012.
Lynaugh listed Chesapeake Energy as a client only in 2011.
The instittute noted that the Ohio Oil and Gas Association is the main lobbying organization for oil and gas interests in Ohio.
It gave $223,291 to candidates and committees in Ohio in 2010.
Click here to read more.