Question: When did the party of Oklahoma's US Senators take control of the body determining the rules of the US House and US Senate?

<P0-S0> They had needed a net gain of at least six seats to obtain a majority. <P0-S1> The Republicans regained the majority of the Senate in the 114th Congress, which started in January 2015; the Republicans had not controlled the Senate since January 2007. <P0-S2> They held all of their seats, and gained nine Democratic - held seats. <P0-S3> Republicans defeated five Democratic incumbents: <SEP> <P1-S0> The Standing Rules of the Senate are the parliamentary procedures adopted by the United States Senate that govern its procedure. <P1-S1> The Senate's power to establish rules derives from Article One, Section 5 of the United States Constitution: ``Each House may determine the rules of its proceedings... '' <SEP> <P2-S0> the constitution designates the vice president of the united states as president of the united states senate. <P2-S1> the constitution also calls for a president pro tempore to serve as the leader of the body when the president of the senate (the vice president) is absent. <P2-S2> in practice, neither the vice president nor the president pro tempore -- customarily the most senior (longest - serving) senator in the majority party -- actually presides over the senate on a daily basis; that task is given to junior senators of the majority party. <P2-S3> since the vice president may be of a different party than the majority and is not a member subject to discipline, the rules of procedure of the senate give the presiding officer very little power and none beyond the presiding role. <P2-S4> for these reasons, it is the majority leader who, in practice, manages the senate. <P2-S5> this is in contrast to the house of representatives where the elected speaker of the house has a great deal of discretionary power and generally presides over votes on bills. <SEP> <P3-S0> however, at the state level, the pattern of split ticket voting and divided government holds. <P3-S1> democrats currently hold one of the state's u.s. senate seats, as well as four of the five statewide offices (governor, superintendent of public instruction, secretary of state and state auditor). <P3-S2> the lone congressional district has been republican since 1996 and in 2014 steve daines won one of the state's senate seats for the gop. <P3-S3> the legislative branch had split party control between the house and senate most years between 2004 and 2010, when the mid-term elections returned both branches to republican control. <P3-S4> the state senate is, as of 2015, controlled by the republicans 29 to 21, and the state house of representatives at 59 to 41. <SEP> <P4-S0> Following the 2000 census, the Oklahoma delegation to the U.S. House of Representatives was reduced from six to five representatives, each serving one congressional district. <P4-S1> In the 112th Congress, Oklahoma's U.S. senators were Republicans Jim Inhofe and Tom Coburn, and its U.S. <P4-S2> For the 112th Congress (2011–2013), there were no changes in party strength, and the delegation included four Republicans and one Democrat. <P4-S3> Representatives were John Sullivan (R-OK-1), Dan Boren (D-OK-2), Frank D. Lucas (R-OK-3), Tom Cole (R-OK-4), and James Lankford (R-OK-5).