Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_26820 ( "Rank" real, "Senator" text, "Date of birth" text, "Entered Senate" text, "Left Senate" text, "State served" text, "Party" text, "Time since entry" text )

### Question ###
On what date did congressman joseph tydings enter take his seat?

### Accurate SQL ###

SELECT "Entered Senate" FROM table_26820 WHERE "Senator" = 'Joseph Tydings'