Michał Kamiński began his political career as a associate of the National Revival of Poland. He then became 1 of the founding members of the Christian-National Unity (ZChN), where he served as assistant chief of the party, Wiesław Chrzanowski.
He besides acted in the youth movement, printing articles in the periodical "National Youth". Kamiński was besides active in the media, being a radio and press writer and manager of radio stations in Bydgoszcz and Łomża. In 1995 he served as press spokesperson for the election committee Hanna Gronkiewicz-Waltz in the presidential election.
In 1997 he obtained a parliamentary mandate from the Electoral Action Solidarity, representing the territory of Łomżyński in the 3rd word of office. Until 2001, he was a associate of the Christian-National Unity, serving as a press spokesperson in this organization from 1996 to 2000. Upon completion of his cooperation with the NSC, he moved on to the Right Alliance (2001–2002), and later in 2002 became a associate of the Law and Justice, where he sat in the national authorities of the group. In 2001, he again won a parliamentary mandate in the Bialystok district, being an active associate of the Committee on Agriculture and abroad Affairs. In 1999 he was declared the best talker of parliament in 1 of the journalistic surveys.
In 2004, Kamiński won the mandate of a associate of the European Parliament who served for 2 terms. After his transition to European politics, he became president of the faction of European Conservatives and Reformists (ECR), despite his political past being burdened with controversy, including his activities in the National Revival of Poland and gathering with Augusto Pinochet. After leaving the Law and Justice in 2010, Kamiński co-founded the Poland organization It is the Most crucial (PJN), but did not actively engage in its activities. In 2012, he founded the Think Tank Institute of State Thought.
In 2014, after a failed re-election to the European Parliament, Kamiński returned to national politics, winning a parliamentary mandate from the Civic Platform list. His activity in the PO was besides short, as he was excluded from the organization in 2016 and then co-founded the European Democrats' parliamentary wheel, and later the European Union Democrats' (EUD) party, with which he became permanently involved. In 2019, he was elected to the legislature for the PSL, winning 176,496 votes and taking the position of Deputy Marshal of legislature of the 10th term. In 2023 he again won the ticket, scoring 198,074 votes and remaining Deputy Marshal. Following an unsuccessful start in the European elections in 2024, Kamiński continued his political activity as vice-president of the UED.
In fresh hours Senator Kamiński has become the central character of the controversial case regarding alleged surveillance in the Senate. In his YouTube program and on TVN24, he described how Marshal of the legislature of Małgorzata Kidawa-Błońska called him with a "render scandal", threatening him and announcing the ethics committee. Kamiński besides revealed that his driver was to be asked to study on him, including his wellness and infirmary visits. The politician stated that there was nothing to blame and described the full situation as an example of a deficiency of control over state institutions, comparing it to the methods utilized in the times of the Polish People's Republic. The legislature Marshal and the head of the legislature Chancellery powerfully denied Kamiński's accusations, explaining that the full case afraid the organization of drivers' work, not surveillance. Kidawa-Błońska called the accusations "crazy" and demanded an apology from Kamiński.
