Bürgerlich-Demokratische Partei Schweiz (BDP) (German) Parti bourgeois démocratique suisse (PBD) (French) Partito borghese democratico Svizzero (PBD) (Italian) Partida burgais democratica Svizra (PBD) (Romansh)
Soon after Eveline Widmer-Schlumpf's election to the Federal Council, the SVP/UDC excluded both her and the SVP/UDC's other Federal Councillor, Samuel Schmid, from the party group. Schmid, like Widmer-Schlumpf, was a member of the SVP/UDC's moderate wing; the party's dominant nationalist wing reckoned them both as unrepresentative of the SVP/UDC's populist campaigns. Some party members demanded that Widmer-Schlumpf and Schmid be thrown out of the party altogether. However, Swiss parties are legally federations of cantonal parties, so the SVP/UDC could not expel them directly. For them to have been expelled, the party's Grisons and Bern sections, to which Widmer-Schlumpf and Schmid belonged respectively, would have had to expel them.
On 2 April 2008, the national SVP/UDC leadership called for Widmer-Schlumpf to immediately resign from both the Federal Council and the party. When Widmer-Schlumpf declined to do so, the national SVP/UDC demanded that the Grisons branch expel her. The Grisons section stood by Widmer-Schlumpf, and was expelled from the national SVP/UDC on the following 1 June.
On 16 June 2008, the delegates' convention of the SVP/UDC's former Grisons branch voted to change its name to BPS Graubünden (Conservative Party of Switzerland-Graubünden), becoming the first cantonal section of what would become the BDP/PBD.[11] A second cantonal section was founded in Bern on 21 June 2008 under the name BDP/PBD (Conservative Democratic Party);[11][12] the change from BPS to BDP was due to a name conflict with the extant minor party Bürgerpartei Schweiz (Citizen's Party of Switzerland), which has the same acronym BPS. As a result, the Grisons branch also changed its name to BDP Graubünden.[13][14] Soon afterward, nearly all of the SVP/UDC's Bern section, including Schmid, defected to the new party.
Upon the BDP's founding, seventeen members of the Grand Council of Bern defected from the SVP. In the 2010 election, the number of BDP councillors increased to 25, making the BDP the third-largest party in Bern, behind the SVP and the Social Democratic Party.
After the BDP lost four seats in the 2019 election (and, therefore, its status as an own parliamentary group), the remaining three parliamentarians decided to join a parliamentary group together with the CVP and the EVP, two other moderate parties.[18]
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