which pitcher had the lowest career era for the minnesota twins, minimum of 1500 innings pitched

Walter Johnson has the best career ERA for the Washington Senators when pitching at least 1500 innings, with an ERA of 2.17.

	NAME	ERA	IP	G	W	L	W%	GS	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Walter Johnson W. Johnson	2.17	5914.1	802	417	279	.599	666	3,509	531	110	34	4,913	1,424	1,902	97	1,363	205	127		23,405	154	5.34	2.07	2.57	0.15	15.0	5.8	1.06	.264	2.89	68	2.42	76	7.48	472.8
2	Tom Hughes T. Hughes	3.02	1776.0	285	84	124	.404	205	884	139	17	15	1,726	595	857	38	567	67	67		7,329	51	4.48	2.87	1.56	0.19	12.1	7.7	1.29	.292	4.34	111	2.79	105	8.75	-34.3
3	Jim Shaw J. Shaw	3.07	1600.1	287	84	98	.462	194	767	96	17	16	1,446	546	677	28	688	24	66		6,574	58	4.31	3.87	1.11	0.16	11.7	10.5	1.33	.280	3.81	102	3.04	101	8.13	-12.9
4	Jim Perry J. Perry	3.15	1883.1	376	128	90	.587	249	1,025	61	17	5	1,711	659	736	166	541	50	35	56	7,791	37	4.90	2.59	1.89	0.79	13.2	6.9	1.20	.257	3.52	89	3.50	96	8.18	35.4
5	Dutch Leonard D. Leonard	3.27	1899.1	262	118	101	.539	251	657	130	23	2	1,951	690	852	84	403	30	6		7,956	55	3.11	1.91	1.63	0.40	8.3	5.1	1.24	.275	4.04	86	3.25	86	9.24	109.1
6	Bert Blyleven B. Blyleven	3.28	2566.2	348	149	138	.519	345	2,035	141	29	0	2,369	934	1,044	243	674	80	2	37	10,542	56	7.14	2.36	3.02	0.85	19.3	6.4	1.19	.283	3.66	84	3.14	81	8.31	202.7
7	Jim Kaat J. Kaat	3.34	3014.1	484	190	159	.544	433	1,851	133	23	5	2,982	1,118	1,343	279	729	96	20	61	12,642	106	5.53	2.18	2.54	0.83	14.6	5.8	1.23	.279	4.01	91	3.33	88	8.90	148.3
8	Casey Patten C. Patten	3.34	2059.1	269	106	127	.455	237	757	206	17	4	2,146	765	1,074	40	556	74	28		8,606	28	3.31	2.43	1.36	0.17	8.8	6.5	1.31	.293	4.69	115	2.98	105	9.38	-26.9
9	Dave Goltz D. Goltz	3.48	1638.0	247	96	79	.549	215	887	80	11	3	1,654	634	729	119	493	24	15	19	6,887	54	4.87	2.71	1.80	0.65	12.9	7.2	1.31	.286	4.01	90	3.43	90	9.09	73.9
10	Firpo Marberry F. Marberry	3.59	1654.0	470	117	71	.622	133	667	64	5	94	1,620	659	769	69	568	37	251		6,994	10	3.63	3.09	1.17	0.38	9.5	8.1	1.32	.274	4.18	85	3.93	94	8.81	41.7
11	Camilo Pascual C. Pascual	3.66	2465.0	432	145	141	.507	331	1,885	119	31	10	2,283	1,002	1,127	214	909	47	60	42	10,471	69	6.88	3.32	2.07	0.78	18.0	8.7	1.29	.279	4.11	95	3.27	84	8.34	176
12	Tom Zachary T. Zachary	3.78	1589.0	273	96	103	.482	210	327	92	10	8	1,822	668	803	54	460	26	44		6,802	23	1.85	2.61	0.71	0.31	4.8	6.8	1.44	.298	4.55	97	3.91	101	10.32	-12.1
13	Frank Viola F. Viola	3.86	1772.2	260	112	93	.546	259	1,214	54	10	0	1,775	760	842	213	521	29	0	17	7,450	45	6.16	2.65	2.33	1.08	16.3	7.0	1.30	.285	4.27	91	3.88	95	9.01	39.2
14	Pedro Ramos P. Ramos	4.19	1544.1	290	78	112	.411	199	740	58	10	12	1,579	719	808	210	491	46	56	34	6,625	23	4.31	2.86	1.51	1.22	11.2	7.4	1.34	.266	4.71	106	4.34	109	9.20	-58.7
15	Brad Radke B. Radke	4.22	2451.0	378	148	139	.516	377	1,467	37	10	0	2,643	1,150	1,233	326	445	62	0	12	10,244	28	5.39	1.63	3.30	1.20	14.3	4.3	1.26	.292	4.53	90	4.24	94	9.71	75.2
16	Sid Hudson S. Hudson	4.38	1819.1	296	88	130	.404	239	597	112	11	6	1,992	886	1,040	109	720	35	40		8,030	27	2.95	3.56	0.83	0.54	7.4	9.0	1.49	.287	5.14	110	3.94	101	9.85	-6.2